<template>
  <div id="app">
    <div class="box">
      <div class="left"></div>
      <div class="mid"></div>
      <div class="right"></div>
    </div>
  </div>
</template>

<script>
import HelloWorld from './components/HelloWorld.vue'

export default {
  name: 'App',
  components: {
    HelloWorld
  }
}
</script>

<style lang="less" scoped>
  #app {
  .box {
    display: flex;
    width: 100%;
    height: 100vh;
    .left {
      flex:1;
      background-color: lightblue;
    }

    .mid {
        flex: 1;
        background-color: lightpink;
    }

    .right {
      flex: 1;
    }
  }
}
</style>
